Abstract
The mechanical maintenance of oxides scales was studied for the chromium (Cr) coated zirconium (Zr) alloy coupons that proceeded oxidation in the 1200 °C steam. During the oxidation process, Cr/CrAlSiN coatings evolved into a structure of a thin and high-quality oxides scale growing over a thick Cr-rich layer, which retained a long-term structural integrity and barrier effect. Moreover, multiple toughening mechanisms could operate in the oxidized specimens when subjected to superimposed stresses. The finite element simulation revealed that the thin scale would generate less growth stress and the thick Cr-rich layer would effectively relieve the stress.
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